EP0743926B1 - Water treatment method and apparatus - Google Patents

Water treatment method and apparatus Download PDF

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Publication number
EP0743926B1
EP0743926B1 EP19950909142 EP95909142A EP0743926B1 EP 0743926 B1 EP0743926 B1 EP 0743926B1 EP 19950909142 EP19950909142 EP 19950909142 EP 95909142 A EP95909142 A EP 95909142A EP 0743926 B1 EP0743926 B1 EP 0743926B1
Authority
EP
European Patent Office
Prior art keywords
basin
water
foam
diffusor
slurry
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Expired - Lifetime
Application number
EP19950909142
Other languages
German (de)
English (en)
French (fr)
Other versions
EP0743926A1 (en
Inventor
Eivind Lygren
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Puraq AS
Original Assignee
Puraq AS
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Filing date
Publication date
Application filed by Puraq AS filed Critical Puraq AS
Publication of EP0743926A1 publication Critical patent/EP0743926A1/en
Application granted granted Critical
Publication of EP0743926B1 publication Critical patent/EP0743926B1/en
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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Classifications

    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/1236—Particular type of activated sludge installations
    • C02F3/1257—Oxidation ditches
    • A—HUMAN NECESSITIES
    • A01—AGRICULTURE; FORESTRY; ANIMAL HUSBANDRY; HUNTING; TRAPPING; FISHING
    • A01K—ANIMAL HUSBANDRY; AVICULTURE; APICULTURE; PISCICULTURE; FISHING; REARING OR BREEDING ANIMALS, NOT OTHERWISE PROVIDED FOR; NEW BREEDS OF ANIMALS
    • A01K63/00—Receptacles for live fish, e.g. aquaria; Terraria
    • A01K63/04—Arrangements for treating water specially adapted to receptacles for live fish
    • A01K63/042—Introducing gases into the water, e.g. aerators, air pumps
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F1/00—Treatment of water, waste water, or sewage
    • C02F1/24—Treatment of water, waste water, or sewage by flotation
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/06—Aerobic processes using submerged filters
    • C—CHEMISTRY; METALLURGY
    • C02—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F—TREATMENT OF WATER, WASTE WATER, SEWAGE, OR SLUDGE
    • C02F3/00—Biological treatment of water, waste water, or sewage
    • C02F3/02—Aerobic processes
    • C02F3/12—Activated sludge processes
    • C02F3/20—Activated sludge processes using diffusers
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02W—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO WASTEWATER TREATMENT OR WASTE MANAGEMENT
    • Y02W10/00—Technologies for wastewater treatment
    • Y02W10/10—Biological treatment of water, waste water, or sewage

Definitions

  • the invention relates to a method and apparatus for treating water. More specifically it is a further development of the method and apparatus described in EP patent publication No. 0 448 597.
  • the water treatment takes place mainly by flotation and physical adsorption based on air bubbles of varying sizes produced from a diffusor at the bottom of a water basin.
  • the flotation process is carried out by means of air bubbles of a size ranging from about 0,03 mm up to about 0,12 mm attaching to particles thus increasing their boyancy. the particles as a consequence are forming a slurry at the surface.
  • the adsorption process occurs via air bubbles of a size about 0,8 mm combining with colloidal or dissolved polarized substances and forming therewith a voluminous bubble foam at the water surface.
  • the diffusor is located in a chamber which is partly separated from the remaining part of the basin by a partition wall and has a substantially smaller volume than that of the latter part.
  • the adsorption process then takes place substantially within this chamber while the flotation process takes place substantially within the basin itself, and the water, owing to the pumping effect from the diffusor bubbles, circulates up through the chamber and out into the basin at the opposite side of the partition wall.
  • the bubble foam is continuously removed as it forms at the water surface in the chamber, while the slurry that is formed way out in the basin is removed at the rim of the basin opposite the chamber. At either place the removal is carried out by allowing the foam and slurry respectively to flow over a weir together with a top water layer.
  • the vacuum technique will disintegrate the foam and further mix it with the slurry to form a homogenous sludge which allows the suspended matter to be separated from the water phase in an effective manner, i.e. by simple sedimentation, such that the water content of the sludge may be reduced by about 2 orders.
  • the plant shown in the drawing is primarily, but not exclusively, built for fish fattening. It comprises a water basin 2 which, in the example shown in fig. 1, has a longitudinal rectangular peripheral wall including side walls 4 and end walls 6.
  • the basin may have a base surface of about 10 m x 50 m, for example, and built for a normal water depth of about 3 m.
  • the basin of the embodiment shown in fig. 1 has a longitudinal inner wall 8 serving to form a circumferential channel 10 in the basin 2.
  • the inner wall extends along the major part of the basin and terminates at a distance from one end wall 6 thereof, such that the water may pass without excessive pressure drop.
  • the flow generator 16 may, for example, be in the form of one or more propellers 12 mounted in a respective opening 13 in inner wall 8 as shown in fig. 3.
  • a longitudinal tubular air diffusor 14 of the type described in EP patent No. 0 448 597, i.e. perforated with apertures capable of producing air bubbles in the range of about 0,03 mm to about 1 mm, the larger bubbles acting by physical adsorption to form a contaminated foam on the water surface substantially directly above the air diffusor 14, and the remaining smaller bubbles acting together with the particulates acting to form a flotation slurry containing particulate impurities at the water surface 15 in the basin, as described in detail in the above EP patent publication No. 0 448 597.
  • the air bubbles from the longitudinal diffusors 14 will also act as a flow generator causing a circulation of the basin water laterally of the longitudinal axis of the diffusors 14, i.e. in the lateral direction of the basin. Water is dragged with the rising air bubbles to create a rising flow along the inner wall 8, outwards toward the side walls 4 at the surface 15, down along the side walls and back along the bottom 19 as indicated with arrows A in the left part of the sectional view in fig. 2.
  • V Z and V X indicate the relative flow velocities in different water layers in the vertical and lateral directions respectively of the basin.
  • V Z and V X vector diagrams
  • z and x refer to the depth and lateral or cross directions respectively of the basin
  • y refer to the longitudinal direction thereof i.e. normal to the plane of the drawing figure 2.
  • the relative flow velocities in the channel 10 both in the z and x directions, decrease from a maximum near the opposite walls 4, 8 and bottom 19 - water surface 15 respectively, to about zero along its central axis.
  • the flow generator 16 in the channel 10 will cause the water in the basin to circulate in the circumferential direction of the basin around the channel 10, as indicated with arrows B in fig. 1, in which a further vector diagram V y is drawn, indicating that the flow velcoity in the longitudinal direction of the channel caused by the flow generator 16 is substantially constant across the channel cross section, at least in the water layer adjacent surface 15.
  • this is visualized by indicating the path of a pollution particle entrained with the foamslurry, from the point P at which it appears on the surface above the diffusor 14.
  • it will float obliquely toward the side wall 4 of the basin in accordance with r a and then follow a peripheral or circumferential flow path S around the basin.
  • the same will happen with practically any pollution particle in the foamslurry at the surface, all of which relatively rapidly concentrates in the peripheral flow path S along the edge of the basin from which it may easily be removed by means of the foamslurry removal means 18.
  • the foamslurry remover 18 comprises a vacuum means, e.g. in the form of a mouth piece 20.
  • a vacuum means e.g. in the form of a mouth piece 20.
  • the suction opening 22 of the mouth piece 20 is located at the level of the water surface 15 and may advantageously be surrounded by a screen or skimmer 24 acting to guide the foamslurry toward the suction opening 22.
  • the mouth piece 20 communicates via a pipeline 26 and a vacuum chamber 28 (fig. 1) with a vacuum source 30, such as a fan.
  • the vacuum chamber 28 and source 30 may suitably be positioned in an adjacent room 32 near the suction mouth piece.
  • the foamslurry and a relatively very small fraction of the surface water are drawn through the mouth piece and into the pipeline were it disintegrate into a thin sludge that enters the vacuum chamber 28 where it can be transferred to an adjacent dewatering vessel 34 in which the sludge is dewatered by any convenient manner.
  • the water part can be diverted back to the basin 2 as indicated with the arrow C, via a weir 36 schematically indicated in fig. 1, or it can be diverted to an effluent pipeline.
  • any refilling of water into the basin may advantageously take place in the area where the water from the weir 36 enters. This also applies in case the plant is to be used for other purposes than the fattening of fish or the like, such as for treating waste water, sewage or other polluted water, in which case treated water would tapped off centrally in the water column in the area between the mouth piece 20 and flow generator 16, in an amount equalling that of the inflowing polluted water. If, in addition to the flotation and physical adoption processes, it is desireable or necessary to have the basin water filtered through a biofilter, such as of the type noted in NO patent No. 172 487, this may advantageously take place in a conventional manner by permitting the basin water to flow through an external circulation circuit (not shown) in which the biofilter is incorporated.
  • a biofilter such as of the type noted in NO patent No. 172 487
  • FIG. 6 An example of a such circular basin 2' is shown in fig. 6.
  • the diffusor means 14' is arranged without any inner wall centrally at the bottom of the basin.
  • the flow generator 16' in the form of a propeller or similar, is disposed near the basin peripheral wall 4' and the foamslurry removal means 18' is positioned relatively close to the flow generator upstream thereof. Otherwise the suction system 20, 24, 26, 28, 30 etc is the same as in the previous example.
  • the diffusor 14' will cause a radially outwardly directed flow component at the water surface, with the result that a polluted particle would float from a point P' in the area above the diffusor curvingly toward the basin peripheral wall 4' and thence follow a peripheral flow path S' around the basin 2' until it is drawn into the foamslurry removal means 18'.

Landscapes

  • Life Sciences & Earth Sciences (AREA)
  • Biodiversity & Conservation Biology (AREA)
  • Hydrology & Water Resources (AREA)
  • Engineering & Computer Science (AREA)
  • Environmental & Geological Engineering (AREA)
  • Water Supply & Treatment (AREA)
  • Chemical & Material Sciences (AREA)
  • Organic Chemistry (AREA)
  • Microbiology (AREA)
  • Environmental Sciences (AREA)
  • Animal Husbandry (AREA)
  • Marine Sciences & Fisheries (AREA)
  • Physical Water Treatments (AREA)
  • Separation Using Semi-Permeable Membranes (AREA)
  • Water Treatment By Sorption (AREA)
  • Excavating Of Shafts Or Tunnels (AREA)
  • Electrical Discharge Machining, Electrochemical Machining, And Combined Machining (AREA)
  • Farming Of Fish And Shellfish (AREA)
  • Removal Of Floating Material (AREA)
  • Aeration Devices For Treatment Of Activated Polluted Sludge (AREA)
  • Water Treatment By Electricity Or Magnetism (AREA)
EP19950909142 1994-02-07 1995-02-06 Water treatment method and apparatus Expired - Lifetime EP0743926B1 (en)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
NO940390 1994-02-07
NO940390A NO180744C (no) 1994-02-07 1994-02-07 Fremgangsmåte og anordning for rensing av vann
PCT/NO1995/000027 WO1995021134A1 (en) 1994-02-07 1995-02-06 Water treatment method and apparatus

Publications (2)

Publication Number Publication Date
EP0743926A1 EP0743926A1 (en) 1996-11-27
EP0743926B1 true EP0743926B1 (en) 1997-09-17

Family

ID=19896818

Family Applications (1)

Application Number Title Priority Date Filing Date
EP19950909142 Expired - Lifetime EP0743926B1 (en) 1994-02-07 1995-02-06 Water treatment method and apparatus

Country Status (26)

Country Link
US (1) US5814229A (ja)
EP (1) EP0743926B1 (ja)
JP (1) JP3274685B2 (ja)
KR (1) KR100310673B1 (ja)
CN (1) CN1077866C (ja)
AT (1) ATE158265T1 (ja)
AU (1) AU677898B2 (ja)
CA (1) CA2182802A1 (ja)
DE (1) DE69500738T2 (ja)
DK (1) DK0743926T3 (ja)
EG (1) EG22476A (ja)
ES (1) ES2106639T3 (ja)
FI (1) FI963099A (ja)
GR (1) GR3025457T3 (ja)
IL (1) IL112562A (ja)
IS (1) IS1699B (ja)
JO (1) JO1827B1 (ja)
MA (1) MA23444A1 (ja)
MY (1) MY111818A (ja)
NO (2) NO180744C (ja)
NZ (1) NZ279921A (ja)
PE (1) PE22595A1 (ja)
TN (1) TNSN95009A1 (ja)
TW (1) TW374754B (ja)
WO (1) WO1995021134A1 (ja)
ZA (1) ZA95830B (ja)

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
SE503569C2 (sv) * 1995-07-06 1996-07-08 Andreas Schelin Anordning för avskiljning av olja ur vatten
US20040149234A1 (en) * 2002-12-04 2004-08-05 Mathur Ashok N. Decentralized oxygen supply system for aquaculture
JP4538479B2 (ja) * 2007-09-04 2010-09-08 日本製紙株式会社 フローテーター
US9095786B1 (en) * 2011-03-04 2015-08-04 Enviro-Tech Systems, L.L.C. Method and apparatus for separation of fluids within a single vessel
CN103972593A (zh) * 2014-05-23 2014-08-06 江苏三环实业股份有限公司 用于铅酸蓄电池化成系统的配酸箱
CN105210976A (zh) * 2014-06-27 2016-01-06 郭其哲 高密度养殖循环水的处理设备
KR20160002656U (ko) 2015-01-21 2016-07-29 이준석 박스포장용 롤 테이프 컷팅기
JP6602133B2 (ja) * 2015-09-25 2019-11-06 グンジ株式会社 活イカ用生簀の清浄化システム
CN105923756B (zh) * 2016-07-10 2019-01-18 赖柱彭 一种曝气池系统
JP6445200B2 (ja) * 2017-06-02 2018-12-26 株式会社林養魚場 魚介類養殖装置
CN109006648A (zh) * 2018-07-28 2018-12-18 福建省水产技术推广总站 水体清污系统及其应用
CN109220971B (zh) * 2018-09-30 2021-06-01 祝煜 水产养殖用增氧设备

Family Cites Families (13)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
GB830531A (ja) *
US2418950A (en) * 1944-06-12 1947-04-15 Lakeside Engineering Corp Settling tank
GB1058914A (en) * 1965-06-14 1967-02-15 Outokumpu Oy Froth flotation apparatus
GB1442547A (en) * 1974-04-24 1976-07-14 Ishigaki Mech Ind Apparatus for treating waste water
DE3126832C2 (de) * 1981-07-08 1985-03-28 Maschinenfabrik Hellmut Geiger Gmbh & Co Kg, 7500 Karlsruhe Belebungsbecken für Kläranlagen mit rundem oder annähernd quadratischem Grundriß
JPS58174289A (ja) * 1982-04-07 1983-10-13 Kyoritsu Yuki Kogyo Kenkyusho:Kk ユニツト型流動担体生物処理装置
DE3567040D1 (en) * 1984-04-03 1989-02-02 Feldmuehle Ag Aeration installation
DE3417550A1 (de) * 1984-05-11 1985-11-14 Linde Ag, 6200 Wiesbaden Verfahren zur biologischen reinigung von abwasser
DE3643931A1 (de) * 1986-12-22 1988-07-07 Kernforschungsanlage Juelich Begasungs/flotationsreaktor
NO885455L (no) * 1988-12-08 1990-06-11 Sunfish Ltd As Fremgangsmaate og anordning for rensing av vann.
JP2790338B2 (ja) * 1989-10-16 1998-08-27 石川島播磨重工業株式会社 脱インク用フローテーション装置
EP0441230B1 (en) * 1990-02-09 1994-07-13 Masakatsu Ozawa Apparatus for separation by pressurization and flotation
US5509535A (en) * 1994-07-12 1996-04-23 Hydrochem Developments Ltd. Flotation apparatus

Also Published As

Publication number Publication date
ATE158265T1 (de) 1997-10-15
KR100310673B1 (ko) 2002-02-28
IS1699B (is) 1998-10-19
NO180744C (no) 1997-06-11
NO963299D0 (no) 1996-08-07
ZA95830B (en) 1996-01-10
NO180744B (no) 1997-03-03
WO1995021134A1 (en) 1995-08-10
DE69500738D1 (de) 1997-10-23
GR3025457T3 (en) 1998-02-27
US5814229A (en) 1998-09-29
CN1139913A (zh) 1997-01-08
MA23444A1 (fr) 1995-10-01
TNSN95009A1 (fr) 1996-02-06
IL112562A (en) 1998-02-08
DE69500738T2 (de) 1998-04-02
FI963099A (fi) 1996-08-07
JO1827B1 (en) 1995-07-05
EG22476A (en) 2003-02-26
JP3274685B2 (ja) 2002-04-15
PE22595A1 (es) 1995-08-07
NO940390D0 (no) 1994-02-07
NO940390L (no) 1995-08-08
AU1719795A (en) 1995-08-21
MY111818A (en) 2001-01-31
NO313045B1 (no) 2002-08-05
ES2106639T3 (es) 1997-11-01
TW374754B (en) 1999-11-21
EP0743926A1 (en) 1996-11-27
NO963299L (no) 1996-08-07
DK0743926T3 (da) 1998-04-14
NZ279921A (en) 1997-04-24
IS4257A (is) 1995-08-08
CA2182802A1 (en) 1995-08-10
IL112562A0 (en) 1995-05-26
FI963099A0 (fi) 1996-08-06
CN1077866C (zh) 2002-01-16
AU677898B2 (en) 1997-05-08
JPH09508314A (ja) 1997-08-26

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